package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        1、获取本次请求的 URI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求地址: {}", requestURI);
//定义不需要处理的请求路径
        String [] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/dish/**",
                "/dish/**/**",
                "/backend/**",
                "/front/**",
                "/front/login/**/",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };
//        2、判断本次请求是否需要处理
        boolean check = check(requestURI, urls);
//        3、如果不需要处理，则直接放行
        if(check ){
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
//        4-1、判断服务端登录状态，如果已登录，则直接放行  从session中获取 判断
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录,用户id为{}", request.getSession().getAttribute("employee"));
            long id = Thread.currentThread().getId();
            log.info("当前的线程Id为,{}",id);

            /*把当前线程LocalThread 里的局部变量 加入进去*/
            Long empId=(Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }
//        4-2、判断客户端登录状态，如果已登录，则直接放行  从session中获取 判断
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录,用户id为{}", request.getSession().getAttribute("user"));
            long id = Thread.currentThread().getId();
            log.info("当前的线程Id为,{}",id);

            /*把当前线程LocalThread 里的局部变量 加入进去*/
            Long userId=(Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

//        5、如果未登录则返回未登录结果 ,通过输出流的方式向客户端页面相应数据

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));



    }

    /**
     * 路径匹配 检查本次请求是否放行
     * @param requestURI
     * @param urls
     * @return
     */
    public boolean check(String requestURI,String [] urls){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match) {
                return true;
            }
        }
        return false;
    }
}
